| 摘要 |
<p>A vacuum document feeder which transports a document page (D) in juxtaposition to an exposure platen (12) of a reproduction apparatus where such page is illuminated for copying. The feeder includes a vacuum plenum (16) having a wall (18) formed with a plurality of spaced ports (22) overlying the exposure platen. A ported transport belt (32,34) is moved in contact with the plenum wall (18) to feed a document page to the platen for copying. The moving belt (32,34) is positioned on the plenum wall (18) so that the belt ports (36) are maintained in spaced relation to the wall ports (22). Further, the wall ports (22) and the belt ports (36) are fluidically interconnected by a plurality of shallow concave grooves (22 min ) formed in the plenum wall (18) so that vacuum within the plenum (16) is effective to tack a document page to the moving belt (32, 34) for movement to the exposure platen. This structural arrangement prevents light trapping by the wall ports during illumination.</p> |
